Mamiya C3, C30 - Split image or microprism viewfinder screen

Does anybody know whether Mamiya made these? Or if somebody else makes them?
I find the standard very difficult to work with, especially when there is not much light.

You can write Rick and get an idea of what is involved in changing the screen for your camera.

Only the C330/C330f, and C330s were designed with user replaceable screens. The other models would need the screen mount dismantled to take a third party item, and you would have to verify the focus.

Mamiya made both 4 degree and 6 degree split image. The 6 degree version is optimised for wide angle lenses. There was also a microprism center spot version, and a rare combined split/microprism.

The C330 and C330f share a screen design. The C330s has a different design.